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Truck scale load cell PR 6221
Installation Manual
Translation of the Original Installation Manual 9499 053 46800 Edition 1.11.0 07/29/2021
Minebea Intec GmbH, Meiendorfer Str. 205 A, 22145 Hamburg, Germany
Phone: +49.40.67960.303 Fax: +49.40.67960.383
Foreword
Must be followed!
Any information in this document is subject to change without notice and does not represent a commitment on
the part of Minebea Intec unless legally prescribed. This product should only be operated/installed by trained
and qualified personnel. In correspondence concerning this product, the type, name, and release number/serial
number as well as all license numbers relating to the product have to be cited.
Note
This document is partially protected by copyright. It may not be changed or copied, and it may not be used
without purchasing or written permission from the copyright owner (Minebea Intec). The use of this product
constitutes acceptance by you of the abovementioned provisions.
Table of contents
1 Introduction.........................................................................................................................................4
1.1 Read the manual.........................................................................................................................................................4
1.2 This is what operating instructions look like..........................................................................................................4
1.3 This is what lists look like...........................................................................................................................................4
1.4 This is what menu items and softkeys look like.....................................................................................................4
1.5 This is what the safety instructions look like..........................................................................................................4
1.6 Hotline.......................................................................................................................................................................... 5
2 Safety instructions...............................................................................................................................6
2.1 General notes ..............................................................................................................................................................6
2.2 Intended use................................................................................................................................................................6
2.3 Initial inspection..........................................................................................................................................................6
2.4 Before operational startup........................................................................................................................................6
3 Setup instructions................................................................................................................................ 7
3.1 Load cell arrangement............................................................................................................................................... 7
3.2 Selecting maximum capacity....................................................................................................................................8
4 Specifications ......................................................................................................................................9
4.1 Load cells .....................................................................................................................................................................9
4.1.1 Equipment supplied with the load cell .........................................................................................................9
4.1.2 General information ........................................................................................................................................9
4.1.3 Possible marking of the load cell for the Ex area...................................................................................... 10
4.1.4 Dimensions ..................................................................................................................................................... 10
4.1.5 Ordering information..................................................................................................................................... 11
4.1.6 Technical data.................................................................................................................................................. 11
4.2 Load disc kits............................................................................................................................................................. 14
4.2.1 General notes ................................................................................................................................................. 14
4.2.2 Equipment supplied ...................................................................................................................................... 14
4.2.3 Dimensions ..................................................................................................................................................... 18
4.2.4 Technical data................................................................................................................................................. 19
5 Installation.........................................................................................................................................20
5.1 Safety instructions....................................................................................................................................................20
5.2 Aligning the load cell.................................................................................................................................................21
5.3 Positioning upper load disc ....................................................................................................................................22
6 Connection......................................................................................................................................... 23
6.1 General information.................................................................................................................................................23
6.2 Load cell .....................................................................................................................................................................24
6.2.1 Load cell cable................................................................................................................................................24
6.3 Cable junction boxes................................................................................................................................................24
Truck scale load cell PR 6221 Table of contents
Minebea Intec EN-1
6.3.1 Lightning protection......................................................................................................................................25
6.4 Cable connections ....................................................................................................................................................25
7 Preparing for calibration.................................................................................................................... 27
7.1 General notes ............................................................................................................................................................27
7.2 Smart Calibration......................................................................................................................................................27
7.3 Mechanical height adaptation................................................................................................................................ 27
7.4 Corner load test ........................................................................................................................................................28
7.5 Electronic corner correction....................................................................................................................................28
7.6 Full load test and shift test......................................................................................................................................28
7.6.1 Full load test ...................................................................................................................................................28
7.6.2 Shift test ..........................................................................................................................................................29
7.6.3 Systematically minimizing shift error.........................................................................................................30
8 Troubleshooting ................................................................................................................................ 32
8.1 General Notes............................................................................................................................................................32
8.2 Visual inspection.......................................................................................................................................................32
8.3 Metrological controls...............................................................................................................................................32
8.3.1 Checking the zero output signal of the load cell.......................................................................................32
8.3.2 Checking the strain gauge bridge of the load cell....................................................................................33
8.3.3 Checking the insulation impedance of the load cell.................................................................................33
8.3.4 Checking the insulation impedance of the connecting cable.................................................................33
9 Maintenance/repairs/cleaning........................................................................................................... 34
9.1 Maintenance..............................................................................................................................................................34
9.2 Repairs........................................................................................................................................................................34
9.3 Cleaning .....................................................................................................................................................................34
10 Disposal ............................................................................................................................................. 35
11 Spare parts and accessories ............................................................................................................... 36
11.1 Replacement parts ...................................................................................................................................................36
11.2 Accessories ................................................................................................................................................................36
11.2.1 Mounting kits..................................................................................................................................................36
11.2.2 Load discs........................................................................................................................................................36
11.2.3 Connecting cables..........................................................................................................................................37
11.2.4 Cable junction boxes..................................................................................................................................... 37
11.2.5 Connexx module ............................................................................................................................................38
12 Certificates/safety instructions/control drawing...............................................................................47
12.1 BVS 16 ATEX E 005 ...................................................................................................................................................48
12.2 IECEx BVS 16.0005...................................................................................................................................................52
12.3 TÜV 03 ATEX 2301X..................................................................................................................................................56
12.4 IECEx TUN 17.0025X.................................................................................................................................................62
12.5 MIN16ATEX001X .......................................................................................................................................................66
Truck scale load cell PR 6221 Table of contents
EN-2 Minebea Intec
12.6 FM17CA0138..............................................................................................................................................................68
12.7 FM17US0276...............................................................................................................................................................71
12.8 4012 101 5688 ...........................................................................................................................................................74
12.9 MEU17025..................................................................................................................................................................75
12.10 RU Д-DE.A301.B.05345 ........................................................................................................................................... 81
12.11 D09-03.15 ..................................................................................................................................................................82
12.12 D09-00.23 .................................................................................................................................................................89
12.13 R60/2000-DE1-08.11...............................................................................................................................................98
12.14 NMI S333A ................................................................................................................................................................101
12.15 14-024A1 ...................................................................................................................................................................110
12.16 10001 .........................................................................................................................................................................113
Truck scale load cell PR 6221 Table of contents
Minebea Intec EN-3
1 Introduction
1.1 Read the manual
-Please read this manual carefully and completely before using the product.
-This manual is part of the product. Keep it in a safe and easily accessible location.
1.2 This is what operating instructions look like
1. - n. are placed before steps that must be done in sequence.
1.3 This is what lists look like
-indicates an item in a list.
1.4 This is what menu items and softkeys look like
[ ] frame menu items and softkeys.
Example:
[Start]- [Applications]- [Excel]
1.5 This is what the safety instructions look like
Signal words indicate the severity of the danger involved when measures for preventing
hazards are not followed.
DANGER
Warning of personal injury
DANGER indicates death or severe, irreversible personal injury which will occur if the
corresponding safety measures are not observed.
Take the corresponding safety precautions.
WARNING
Warning of hazardous area and/or personal injury
WARNING indicates that death or severe, irreversible injury may occur if appropriate
safety measures are not observed.
Take the corresponding safety precautions.
CAUTION
Warning of personal injury.
CAUTION indicates that minor, reversible injury may occur if appropriate safety
measures are not observed.
Take the corresponding safety precautions.
is placed before a step.
describes the result of a step.
Truck scale load cell PR 6221 1 Introduction
EN-4 Minebea Intec
NOTICE
Warning of damage to property and/or the environment.
NOTICE indicates that damage to property and/or the environment may occur if
appropriate safety measures are not observed.
Take the corresponding safety precautions.
Note:
User tips, useful information, and notes.
1.6 Hotline
Phone: +49.40.67960.444
Fax: +49.40.67960.474
eMail: [email protected]
1 Introduction Truck scale load cell PR 6221
Minebea Intec EN-5
2 Safety instructions
2.1 General notes
NOTICE
Warning of damage to property and/or the environment.
The product was in perfect condition with regard to safety features when it left the
factory.
To maintain this condition and to ensure safe operation, the user must follow the
instructions and observe the warnings in this manual.
2.2 Intended use
The load cell PR 6221 has been designed especially for use in truck scales.
The load cell PR 6221 may be used only for weighing tasks in truck scales as intended.
In intrinsically safe circuits, only load cells PR 6221/..E may be used.
The dimensions of all mounting and structural components must be calculated so that
sufficient overload capacity is ensured for all loads which may occur while taking the
relevant standards into account. In particular, upright weighing objects must be
safeguarded against the weighing installation turning over or being shifted, thus
eliminating danger to people, animals, or goods even in the case of a break in a load cell
or mounting element.
Installation and repair work must only be carried out by expert/qualified personnel.
The load cell reflects the state of the art. The manufacturer does not accept any liability
for damage caused by third-party system components or due to incorrect use of the
product.
2.3 Initial inspection
Check the contents of the consignment for completeness. Check the contents visually to
determine whether any damage has occurred during transport. If there are grounds for
rejection of the goods, a claim must be filed with the carrier immediately. The
Minebea Intec sales or service organization must also be notified.
2.4 Before operational startup
NOTICE
Perform visual inspection.
Before operational startup as well as after storage or transport, inspect the load cell
visually for signs of mechanical damage.
Truck scale load cell PR 6221 2 Safety instructions
EN-6 Minebea Intec
3 Setup instructions
3.1 Load cell arrangement
Key
Load application
Stop
A 5 mm
-The supporting structure of the scale (and thus the load cells) as well as the
weighbridge must be stable enough to withstand the specified loads, horizontal
(check with spirit level!) and flat.
-Transverse and/or horizontal forces and torques exceeding the permissible limits are
disturbances which can generate measuring errors and, in the worst case, may
damage the load cell.
-If stops are used, damage and measuring errors can be prevented without affecting
the required space for movement in the direction of the measurement.
The lateral play of the weighbridge must always be restricted to the distance "A" (see
figure) in the longitudinal and transverse direction by appropriate stops.
Consideration should be given to the fact that thermal expansion and contractions
may constrict the required space for movement of the object to be weighed and
could thereby lead to significant falsification of the measuring results.
3 Setup instructions Truck scale load cell PR 6221
Minebea Intec EN-7
3.2 Selecting maximum capacity
Forces exceeding the safe load limit Elim in the measuring direction may change the
characteristics of the load cell or damage it.
If the safe load limit Elim of the load cell can be exceeded, e.g. by falling loads, then
mechanical limiting in load direction is strongly recommended.
If the destructive load Edof the load cell is exceeded, there is danger of mechanical
destruction.
Truck scale load cell PR 6221 3 Setup instructions
EN-8 Minebea Intec
4 Specifications
4.1 Load cells
4.1.1 Equipment supplied with the load cell
No. Description
1 Load cell
2 Quick guide
3 Calibration Certificate
4 Only with Ex-load cells:
Safety information for Ex-load cells
4.1.2 General information
Restoring force For each mm of displacement that the top of the load cell is shifted from the vertical
axis, a horizontal restoring force of 1.55% of the load resting vertically on the load cell
is generated per millimeter deflection (measured at the load cell head).
Material for load cell
housing
Stainless steel 1.4301 acc. to DIN EN 10088-3 (corresponds to AISI 304, B.S. 304S11/
S15)
Protection against en-
vironmental influences
Hermetically sealed by welding.
Filled with inert gas.
Protection classes in compliance with IEC 529 or DIN EN 60529 IP66/IP68/IP69,
in compliance with ISO 20653 IP6K6K/IP6K8/IP6K9K:
Dust-proof and leak-tight against water, with harmful effects when immersed, (1.5 m
water depth, 10,000 h) and water jets (high pressure and temperature).
Explosion:
Suitable for explosion subgroup IIC and IIIC.
Protection type Intrinsic safety for PR 6221/..E
Ambient temperature in
the Ex area
see additional information “safety instructions for Ex load cells”
Cable diameter 5 mm
Cable length Standard version: 16 m
Ex version: 20 m
Cable gauge 4×0.35 mm2
Cable bend radius ≥25 mm (fixed installation)
≥75 mm (flexible installation)
Cable sheath material Thermoplastic elastomer (TPE)
Cable sheath color Green (standard version)
Blue (Ex version)
4 Specifications Truck scale load cell PR 6221
Minebea Intec EN-9
4.1.3 Possible marking of the load cell for the Ex area
Zone Marking Certificate no. for
0 and 1 II 1G Ex ia IIC T6 Ga
Ex ia IIC T6 Ga
BVS 16 ATEX E 005
IECEx BVS 16.0005
only PR 6221/..E
20 and 21 II 1D Ex ta IIIC T160 °C Da
Ex ta IIIC T160 °C Da
TÜV 03 ATEX 2301X
IECEx TUN 17.0025X
all PR 6221 without
/..E
2 II 3G Ex nA IIC T6 Gc MIN16ATEX001X all PR 6221 without
/..E
22 II 3D Ex tc IIIC T85 °C Dc MIN16ATEX001X all PR 6221 without
/..E
IS CL I, II, III, DIV 1, GP A, B, C, D, E, F, G Entity -
4012 101 5688
NI CL I, II, III, DIV 2, GP A, B, C, D, E, F, G - 4012
101 5688; NIFW
T4A Ta= -40°C to 70°C; T5 Ta= -40°C to 55°C
FM17US0276 all PR 6221 without
/..E
IS CL I, II, III, DIV 1, GP A, B, C, D, E, F, G Entity -
4012 101 5688
NI CL I, II, III, DIV 2, GP A, B, C, D, E, F, G - 4012
101 5688; NIFW
T4A Ta= -40°C to 70°C; T5 Ta= -40°C to 55°C
FM17CA0138 all PR 6221 without
/..E
NOTICE
Installation in the Ex area
For installations in the Ex area, it is imperative to observe the Ex safety instructions in the installation
manuals.
4.1.4 Dimensions
all dimensions in mm
Truck scale load cell PR 6221 4 Specifications
EN-10 Minebea Intec
4.1.5 Ordering information
Model Max. capacity
Emax
Type
PR 6221/12.5 t 12.5 t ..C3/C3E/C4/C4E
PR 6221/20 t 20 t ..C3/C3E/C4/C4E/C5/C5E/C6/C6E
PR 6221/25 t 25 t ..C3/C3E/C4/C4E/C5/C5E/C6/C6E
PR 6221/30 t 30 t ..C3/C3E/C4/C4E/C5/C5E/C6/C6E
PR 6221/50 t 50 t ..C3/C3E/C4/C4E/C5/C5E/C6/C6E
PR 6221/60 t 60 t ..C3/C3E/C4/C4E/C5/C5E/C6/C6E
PR 6221/75 t 75 t ..C3/C3E/C4/C4E/C5/C5E/C6/C6E
4.1.6 Technical data
Designation Description Abbr. C3 C4 C5 C6 Unit
Accuracy class 0.015 0.012 0.010 0.008 % Emax
Minimum dead load lowest limit of specified measu-
ring range
Emin 0 % Emax
Maximum capacity highest limit of specified mea-
suring range
Emax see Chapter 4.1.5
Highest load without irreversib-
le damage
Emax = 12.5 t Elim 37.5 37.5 … … t
Emax = 20 t Elim 40 t
Emax = 25 t Elim 37.5 t
Emax = 30 t Elim 60 t
Safe load limit
Emax = 50, 60, 75 t Elim 75 t
danger of mechan. destruction
Emax = 12.5 t Ed>75 >75 … … t
Emax = 20 t Ed>100 t
Emax = 25 t Ed>75 t
Emax = 30 t Ed>150 t
Destructive load
Emax = 50, 60, 75 t Ed>150 t
Minimum LC verifi-
cation
minimum load cell scale inter-
val, vmin = Emax/Y
Y 14000 20000 20000 20000
recurrence of the minimum pre-
load signal (DR = ½×Emax/Z)
Z 6000 8000* 8000* 8000*
Emax ≥50 t Z 6000 6000 6000
Minimum preload si-
gnal recurrence
* Z = 8000 at -10°C…+40°C; Z = 6000 above +40°C
4 Specifications Truck scale load cell PR 6221
Minebea Intec EN-11
Designation Description Abbr. C3 C4 C5 C6 Unit
relative output signal at maxi-
mum capacity
Emax = 12.5 t Cn1.0 1.0 … … mV/V
Emax = 20, 30 t Cn1.0 mV/V
Emax = 25 t Cn2.0 mV/V
Emax = 50 t Cn2.0 2.0 1.5 1.5 mV/V
Emax = 60 t Cn2.4 1.5 1.5 1.5 mV/V
Rated output
Emax = 75 t Cn3.0 1.5 1.5 1.5 mV/V
Tolerance on rated
output
permissible deviation from ra-
ted output Cn
dc<0.07 % Cn
Zero output signal load cell output signal under un-
loaded condition
Smin 0 ±1.0 % Cn
Reproducibility max. change in load cell output
for repeated loading
ɛR<0.005 % Cn
Creep max. change of output signal at
Emax during 30 minutes
dcr <0.015 <0.0125 <0.010 <0.008 % Cn
Non-linearity1) Deviation from the best straight
lines through zero
dLin <0.01 <0.01 <0.01 <0.01 % Cn
Hysteresis1) max. difference in LC output
between loading and unloading
dhy <0.0165 <0.0125 <0.010 <0.008 % Cn
Temperature effect
of the Smin
max. change of Smin in BTTKSmin <0.01 <0.007 <0.007 <0.007 % Cn/10 K
Temperature effect
on C1)
max. change of C in BTTKC<0.01 <0.008 <0.007 <0.005 % Cn/10 K
Input impedance between supply terminals RLC 1080±10 Ω
between measuring terminals RO1010±1 Ω
Emax = 50 t RO1010±1 1010±1 760 ±1 760 ±1 Ω
Emax = 60 t RO1010±1 635 ±1 Ω
Output impedance
Emax = 75 t RO1010±1 510 ±1 Ω
Insulation impedan-
ce
between measuring circuit and
housing, UDC = 100 V
RIS >5000 MΩ
Insulation voltage between circuit and housing
(PR 6221/..E only)
500 V
Recommended sup-
ply voltage
to hold the specified perfor-
mance
Bu4 to 24 V
permissible for continuous ope-
ration without damage
Umax 32 VMax. supply voltage
for PR 6221/..E: Umax 25 V
Truck scale load cell PR 6221 4 Specifications
EN-12 Minebea Intec
Designation Description Abbr. C3 C4 C5 C6 Unit
Nominal ambient
temp. range
to hold the specified perfor-
mance
BT-10 to +55 °C
Service temperature
range
permissible for continuous ope-
ration without damage
BTu -40 to +95 °C
Storage temperature
range
without electrical and mechani-
cal stress
BTi -40 to +95 °C
Permissible eccentri-
city
permissible displacement from
nominal load line at the head of
the load cell
Sex 5 mm
Vibration resistance Resistance against oscillations
(IEC 60068-2-6 Fc)
20 g, 100 h, 10 to 150 Hz
Barometric pressure
influence
influence of barometric pressu-
re on output
PKSmin 420 g/kPa
elastic deformation under maxi-
mum capacity
Emax = 12.5 t Snom 0.2 0.2 … … mm
Emax = 20 t Snom 0.4 mm
Emax = 25 t Snom 0.5 mm
Emax = 30 t Snom 0.5 mm
Emax = 50 t Snom 0.8 mm
Emax = 60 t Snom 0.9 mm
Nominal deflection
Emax = 75 t Snom 1.1 mm
1) The data for non-linearity (dLin), hysteresis (dhy) and and temperature effect on C (TKC)
are typical values.
For OIML R60 or NTEP approved load cells the sum of these values is within the per-
missible cumulative error limits.
Definitions acc. to OIML R60
The technical data given are intended solely as a product description and should not be
interpreted as guaranteed properties in the legal sense.
NTEP: min. scale interval of the load cells vmin
Type Divisi-
ons
nmax
12.5 t 20 t 25 t 30 t 50 t 60 t 75 t Unit
Class III
L Multi-
ple
C3 10000 0.43 0.48 0.60 0.71 1.19 1.43 1.79 kg
4 Specifications Truck scale load cell PR 6221
Minebea Intec EN-13
4.2 Load disc kits
4.2.1 General notes
Note:
The load disc kit is not included in the equipment supplied with your load cell.
For the order numbers of the load disc kits, please refer to Chapter 11.2.2.
4.2.2 Equipment supplied
4.2.2.1 Load disc kit PR 6021/00N
No. Description
1 Upper load disc
2 Flexible copper strap
3 Lower load disc
4 Supporting ring
Truck scale load cell PR 6221 4 Specifications
EN-14 Minebea Intec
4.2.2.2 Load disc kit PR 6021/02N
No. Description
1 Upper load disc
2 Flexible copper strap
3 Lower load disc
4 Supporting ring
5 Anti-twist protection
4 Specifications Truck scale load cell PR 6221
Minebea Intec EN-15
4.2.2.3 Load disc kit PR 6021/04N
No. Description
1 Turbo Load disc
2 Flexible copper strap
3 Lower load disc
4 Supporting ring
Truck scale load cell PR 6221 4 Specifications
EN-16 Minebea Intec
4.2.2.4 Load disc kit PR 6021/06N
No. Description
1 Turbo Load disc
2 Flexible copper strap
3 Lower load disc
4 Supporting ring
5 Anti-twist protection
4 Specifications Truck scale load cell PR 6221
Minebea Intec EN-17
4.2.3 Dimensions
PR 6021/00N, ../02N
all dimensions in mm
Truck scale load cell PR 6221 4 Specifications
EN-18 Minebea Intec
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